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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa189c9c6b5a643033c6472dcee7525da0a594c5cff4ccc7e03935e57826cc0' 
  AND token = '7znTF7rEqoi6y5OHpSePtOCKkCotdlZaEjb2/F5zrvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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