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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f82d1ac0d73e6bf35149ae88beec08a37a5bb2c73f3986918b0848602ae70b5' 
  AND token = 'Mz0nWzRMQdgXcGU8seU3kGBvFXiXlkVy/A8uPeY/SbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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