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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b30dd12715b4b4873c9d7f3f4971ef6bde7174eb2e8cc3ce2e00d186aad8d4' 
  AND token = 'IZFXqQUaL3jj3Hms0lN01jjoDZUUR/D24G7m4mGIxyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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