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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23080f2355396cbf4958aaa155acdf53822c48d92d58df9e061099dd53c6865' 
  AND token = '2hBNo2PFEtBNv8fOkt2V3phFYmvIFywsKnqZ6Ga58eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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