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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099ed2a5c9c4be8d8e2c1f798647be095dc0015f47cb0c78feb1f24777536db7' 
  AND token = '0LBj5LGOggRATvzNbqEmQlRiSSysPA3OvvTVcanee1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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