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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149b776d1db0d027ade358e4f52379652a630b0d323c8ce34b0aae106e7311eb' 
  AND token = 'sBDRUykyYIrH5DPy0U20l0Qb7RsrRVxTC6LKxxglJO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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