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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e6a0b7b18ce45007bee9e7130473bbedd7b74ffe618b095b8ca9b0398da0ea' 
  AND token = 'h2LttH87PWXG8iJF5TFW7jFaSxXMLAYKbBiapIXola0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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