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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f130bfa8e6e5d7121d5384f80a475f90269925e052972515b0916240aaf9213' 
  AND token = 'rtklnrjwwT/jAl43nTWt1RENyh99L5WQBTnCz8Wmzw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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