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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990e7412b808e463d135827de69da26ac9736a8c99b0388df985cb39ab8b1777' 
  AND token = '6Y1jsH+6Rchs/19NNyDXlbZxRdBztf09DazSLs65fWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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