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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbb0930922d83a71e3d7185e1795f7966681288a32fed28c538dc90123f6e06' 
  AND token = 'xAEkCbzdpCwPb7C4KwYXfsC+dwp1mKk6Lfgrw77H6oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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