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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a04f030e44192549c3746bef15998419308d453c32b5da1fdaa90b9ca9f10d' 
  AND token = 'lJw7ciIrSNdZfqNQGigaCPl87vuBDBASrZmwSFtbUwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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