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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecaa02b421173b0a3abe0accce0ee8326c40217ddd492d4f524bf33e03565795' 
  AND token = 'WjH4jJyYKAAogFpdALMycmmle8IQcZ61LJ3u9kusk/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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