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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979286414a5e8ac4facd7b693db50da396c8f9d4817781444ce72fc73a1b3940' 
  AND token = 'B62NVeToherlmbaRnecTaYM+BRu+33AZ/qsSfNT+teI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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