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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29f5518fcd73285fec9c56f70bb2f11eea52bcea1e78c7ec5b4bd973a1bd35d' 
  AND token = 'gbrdCIj1IkagYdYaqazC8w/8W1gaMAysC87E5agcqCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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