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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d2b31abdb079dbeadf375d2ab684604e59e7819e22b626ed24d84d868a888d' 
  AND token = '/moHqx54eKXjoCxBP1iq1hHo/TfLQiSe3PPxvTza9A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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