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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bde79a187c6bc0fbe523ea388f914ee979c29359a010b4a005c11eb300db411' 
  AND token = 'eQZfK13fuBxmi4nVh51oZMaDT+0rh+noJKip+MhNI2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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