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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ffeb14c1b8c8f47fb124c8bfff1eacecdddd1519b5ea4940ee5f53245f2cd7' 
  AND token = 'WvjtEuw2KltgJsSdCghxxVw96OOMA4+Gxm+lu/vCay8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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