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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c3239abef0648ac494ef6f4a6ef2d29a93b3b61b2966549961d6e94de29108' 
  AND token = 'x5+alXrGeBu9t5N4pRjzwbDsU117iCqYRiLqMrzEP64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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