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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7dffed981af3d713c3bc567e874857f709bf8b1b16681b7a0ad831f4653f27' 
  AND token = 'ktmi5JSx80T+ct4OTA1dJtiAsBiInrCjwesvY69p8wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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