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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c284c7773446eb9d8c37a2cabf11f4c776d9ce5cf8380e47001df27ad582cda7' 
  AND token = 'Z/An0PyBCpYn/C2ZR3T/PsrDy9LWhmgSlY1hjn9YM8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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