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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263df520c4ea272f92a832e4e52a34d85942d3685e829c609c0bd6a1ed3f1f58' 
  AND token = '9WLapykYrNTgBxT5bunr1lQOKYw0KhSDvAIfnrtmp/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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