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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4cf24e0d92ecc002a716799386966b5d7348f918f65f4df5a964e2d1ff5434a' 
  AND token = 'uAKnOUYiuM0aI5MPfSGZCGGZTqtQSm0YB57ImZeEh3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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