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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4eef45751765285b9fb82d5f661bf324cec8b281e5e9d655f0b73f57e27e5bd' 
  AND token = 'GAm+U0CWmGfyW+paqWDJLKPfefEw5o9Gw5VzpNhR/YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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