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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59cdc96d46cf0982c1f9077d84b26a68cc82f86d09d058d8fd4f8753d72c566' 
  AND token = 'I3H6iHDife2G384WGfvWEwv7tPYgXAXE+sI4QOBUGtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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