SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02153154c952d9a4adcfa63ffeb586f42928054e03785b3bec0016e0fe6d101' 
  AND token = '+Aa9byemGlKIsLpVLUvJBs4s9jntFQGgvsHN+iYPEXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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