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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9f07e2d82858149c50f2fd0ff3de4dd0323ab0b4c40dc0bc18492466ff5b97' 
  AND token = 'gDwSlc7c1ie2DoYuoqmFgH5gx2kFDfnIjj4h94jE1CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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