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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d7fd878e9560acc58eee38e867df3f69aca5b0a5ebe5157089c4c9421ee95b' 
  AND token = 'egpLlbXx8ggqh0ugodnPgQ/stsPERCvIfIzr8hDYEOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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