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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5440d443c68b3745de2a559e9611165614e2209ac16eac225f69f89f4e6d253' 
  AND token = '1sOUhDcN5zkTeOIsjnOyTQIhKsNMMKN6Pyixu9nAjFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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