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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d0570a564fd3d3249eda6a42b021320408ae248ee3b10baea23dadfa801803' 
  AND token = '2CpFKjBf6ke5LrpX7qx8N7Um+eblvA4BR2+ZGNpnAXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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