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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd4c5df38d76d6d2843d415c86074a3eea0840feec437c7af7f2acffd37948f' 
  AND token = 'Kse83Ghnu9rkKT0wuT77DGE+RAsa4MvPQJBf8Bj0MEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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