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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2a7a99b9e84aef4441111f801604f71284f4c71ef1549abe0f93cc926e848d' 
  AND token = '8Xd9AFn60lGZmMvhT4svLsFj8flsQ/mUi9pOP0tbFhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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