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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f0c608aeae31d81c438f9a6a001bd64c3517de477f17ee7f96b44efc93c76f' 
  AND token = 'LaQb7GWdTRDJFNHk11vDpbYZJkkSz/hI2Z8XvKMEDjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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