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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ac8d66dd04ad2f9138eb3bf5afa0a0868deffb6a21d66ddb188047ab582400' 
  AND token = 'e7vmECHhns0Q2sA3JBkb0TTJKkv0aW6uwwxHKYTGEw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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