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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17617d7bd48cb9aaff259aec4634c31ee972dbf960ffe29720f3a32eb7a1eec4' 
  AND token = 'm83qxWa96s7cCIcEqU9RderFakITneoLuGWtAnlCcpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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