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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd999b39edd93a06e181d65382f59bbb9f6eb565d19e04d0922aeee4db3402e6' 
  AND token = 'hiq7ehpIz3txdB120SPJ8j2nb0XYdL94Sb7MpO/GYF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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