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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609c574823b7c3a6af6bdab85c19d81b9d35bde2eb6a9cb6a300ff4569000b55' 
  AND token = 'oCcnsk7zQiwkVXxF+MVTmCOmrstgEuL8sKIwfpEEWzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}