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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3d1dbba9329c0894c5f3aa4abb818c46baa131a2b9524fe9052eff18cbb799' 
  AND token = 'KbkBIsYlAUIEIZ8q3GI0Opu2eAAO3ke4hA7jzeCi45g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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