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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84937f1e6136ed97fcf7c917439160ff77627c5d93698777fa960126b3a2b466' 
  AND token = 'Fphv4LHFgv+vPQXD3yqQai6fWr/u9zkG8AhRcqAS16U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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