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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc101f9c8f6f08b6332997803ce4e89f317058c9a57fd38bee2dbc075197e4ba' 
  AND token = '+G6793AezKwKPujXUAJ6pROc9S/sAP4ye/B3o65Fk9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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