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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ef159c9d4ab37fae7cdef6820444fd8581522caaba8351e7a42f53f3cf3ec7' 
  AND token = 'OoClJnNMh9GQ2xwaSvdlFrBfz4ShdbIyBcQvalYXy2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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