SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2c89171794ce1a278f5ac8f51252a588443b039976fe3783178ffd90df4a446' 
  AND token = '/zeUw9bV+663saJgvWZY4d8g2BEX4K1GWJ38hxZaJGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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