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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3755bf308911105df8a0a94c6431e2c358ee1815b9624c6180f42b2f2e27c6' 
  AND token = 'C7xkyz/c5VQQ4Mt03JbRGXj9pXX8BcRge5qAgU2DADM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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