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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1788677b233b45e1c31da0ac3a50cbdd1c6817939ae06b811b7a3a2a02ba88af' 
  AND token = 'KLejPaCpiWE8IL3KBdrx2BIrCdKX+UCoyebW8sIM5DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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