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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff679244d7ed68b766ce31c0f851350d4b6e51bf9771a3fbb53605d7d8f36ee' 
  AND token = 'zzKCbmA/EXxiO9+sSTdKVl38zfpb+QRcc26QfwZZ4sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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