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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7811205cae11152e856c29d00427f45fddffa58f0270c7b9987cea87359d1145' 
  AND token = 'XM+kvNZFe4e6bI4KiHPxwyDpMiQ0N2bhHE4MbrJ05MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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