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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fb72068cbcf50a5f056d61e497cb1b3e76b350e3f50dfae346607285632f77' 
  AND token = 'HY7OmRUJKJjXtYYcHwquqc0KWuIyFIJjU91jHabP/Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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