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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890b97c509deeaf0b47ffda5b5f66c3ae2aae9dddcf4214731a6a2f92b581653' 
  AND token = 'z+/WDEfAn26lLQEI4vGerl79VGvQnwzj/9IlYCZbd08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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