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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0913e4df6db965b94d640dc76e196bd6f2eb77d1089e93dfad98247703bd4639' 
  AND token = 'K/jY7tDWXiC1eUIYixoRqXWTL3ZBs/yyiKq53sOYtdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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