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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e03b64013d61134bdd028babc755c8a5e9a5a845fe7e93608f534aa115941e4' 
  AND token = '1D929mdNVK2IMPpDjLkRW+smG3J4c+W/lio7p5pt48M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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