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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d03f092cbf5265e4e1605fa2c6f19fbf68d759947b78c05cb73b064afd4b43' 
  AND token = '8UJ2waYZT71h0g92ermwwM2Sv8MROJRqfIlWgsSFbMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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