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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b6f54da2dceb523e0ce080ef8ea09bf3da23e51a52fdd9c83a367d1586fd39' 
  AND token = 'm+znjvO7LX39Ng+ieqY1d4ONvO+wCJkzSoy7nV2TFyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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