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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e084a622dd9174c09fe8387ba50e677f30fa440e0eb3cc8ad1d2f687856bd4' 
  AND token = 'UpetFOvNHmLrdU2ucH8klcZmswl05xbW523qRVumiWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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