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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b538a58af5068bb608b29261e95649bac8b0c916701a99cf98271bdfc7c301' 
  AND token = 'D9+lPtYwQxT4ElKOLKe411UYlsWxnzsYtiA7d9IOO3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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