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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b99ff7403c17d8e96b521eae2ae0331e20ccf1d3e5bb96306b297f6877c5b37' 
  AND token = 'D5u1tWWVnH9u/l8ml+Ju2Sp0mQRjkoUzsAyhH8M9mhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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