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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da7c94e1a68bcdee9a6c13e5a2a359a67c6310d4bf8fb67c53d3aa22c97dc56' 
  AND token = 'pHCs7go0t4330iczoKzkvsdEbEybtFhpnVbudtbY+YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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