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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea1252be2684fb93f11a365874e462c185877b8d4827525c4d31523099a7c865' 
  AND token = 'v08OlfF8EbKYf+RgnJqXsRJ0xLet5b8nHcB6BEtProY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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